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我繼續使用Parse來細化我的UICollectionViewController的實現,這次我正在處理一個問題,它可能與緩存或reloadData方法本身有關。使用UICollectionView reloadData刷新控件問題
也許你可以幫我鑑定的這種奇怪的行爲的來源,我好給你一個簡短的視頻,以節省時間:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:@selector(refershControlAction) forControlEvents:UIControlEventValueChanged];
[self.collectionView addSubview:refreshControl];
[self queryForTable];
}
然後在我的refreshControlAction:
- (void)refershControlAction
{
NSLog(@"Reload grid");
// The user just pulled down the collection view. Start loading data.
[self queryForTable];
[refreshControl endRefreshing];
}
查詢方法是這樣的:
- (void)queryForTable
{
PFQuery *query = [PFQuery queryWithClassName:@"Photo"];
query.limit = 15;
[query orderByAscending:@"createdAt"];
[query setCachePolicy:kPFCachePolicyNetworkOnly];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
// The find succeeded.
NSLog(@"Successfully retrieved %d photos.", objects.count);
[self.collectionView reloadData];
gridImages = [[NSMutableArray alloc] initWithCapacity:objects.count];
// Do something with the found objects
for (PFObject *object in objects) {
PFFile *thumbnail = [object objectForKey:@"thumbnail"];
[thumbnail getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
if (!error) {
// Now that the data is fetched, update the cell's image property with thumbnail
//NSLog(@"Fetching image..");
[gridImages addObject:[UIImage imageWithData:data]];
//NSLog(@"Size of the gridImages array: %d", [gridImages count]);
} else {
// Log details of the failure
NSLog(@"Error: %@ %@", error, [error userInfo]);
}
}];
}
} else {
// Log details of the failure
NSLog(@"Error: %@ %@", error, [error userInfo]);
}
}];
}
這不會發生在我的PFQueryTableViewController,我正在執行完全相同的查詢,我也在使用iOS 6刷新控件而不是Parse提供的那個。
您是否看到可能導致此行爲的內容?
哪裏是你的數據源,你會得到它更新? – babygau